Improvement in calculators



W. M. BRIGGS. Calculator.

No. 222,126. Patented Dec. 2, 1879.

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l. PETERS, PKOTO-LXTHOGRAFHER, WASHINGTON D Q UNITED STATES PATENT OFFICE} WILLIAM M. BRIGGS, OF STOUGHTON, ASSIGNOR TO HIMSELF AND JOSIAH TISDALE, OF NORlVOOD, MASSACHUSETTS.

IMPROVEMENT IN CALCULATORS.

Specification forming part of Let-tors Patent No. 222,126, dated December 2, 1879; application filed August 14, 1879.

To all whom it may concern Be it known that I, WILLIAM M. BRIGGS, of Stoughton, of the county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in Arithmetical Galculators; and do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figure 1 is a top view, and Fig. 2 a transverse section, of a mechanical calculator embracing my invention, the nature of which I have duly defined in the claim hereinafter presented.

In such drawings, A denotes a rotary disk or limb, pivoted at its center to a base-plate, E, on which it rests flatwise. On the upper surface of the said base-plate, and surroundin g the limb or circular disk A, is a stationary divided limb or annular scale, B, which, at and near itsinner periphery, is centesimally divided and numbered as represented-that is to say, it is divided into one hundred parts, and there is upon each division a number indicative ofit.

The rotary limb or disk A is also similarly oentesimall y divided and numbered at and near,

its periphery in manner as represented, the number indicative of each centesimal sectoral division being placed on it.

Furthermore, the disk is centesimallypunctured or perforated with holes, there being one hole to each division of the range of hundred holes shown at a.

A stationary flat arch, O, is extended from the pivot b of the rotary disk A to and partly over the ninety-ninth and one-hundredth divisions of the stationary limb B, and there projects down from such arch a small tooth or stud, 0.

There is on the rotary disk a stellated wheel, D, which at its center is pivoted to the disk, and revolves within a circle, (I, which, as shown, is divided into ten equal parts, and has the numbers from one to ten arranged therewith, as represented, the stellated wheel having ten teeth.

The above-described calculator may be employed in manner as follows: For adding a column of two figures to each number thatis to say, should we desire to find the sum of the addition of the numbers 18, 24, and 36we.

first, by a pin or awl inserted in the hole at the division 18 on the rotary limb, turn the said limb around on its pivot until the pin may bring up against the arch O, and thus carry the division 18 of the limb A against the division 100 of the stationary limb. The next number being 24, we insert the pin in that hole of the disk which is opposite the twenty-fourth division of the stationary limb and move the limb A, as before, until the pin may again bring up against the arch. Now opposite 36 on the scale of the stationary limb we shall find the number 78 of the movable limb, such number being the sum of the said numbers 18, 24, and 36.

The stellated wheel is to indicate on its scale each hundred in the sum of the numbers, as the said wheel should be so made and arranged that at the proper time in each entire revolution of the limb Ait, (the said stellated wheel,) by being borne against the stud or tooth 0, shall be revolved the necessary ex tent or are of a circle to move each tooth of such wheel from one division to the next one on the circular scale immediately about the stellated wheel.

With an arithmetical calculator made as described a person may soon become very expert in effecting the addition of various numbers, and also can pertormsubtraction of one number from another, the result in either case being correct.

The stellated wheel may gear into another such wheel in a manner to revolve the latter one-tenth of a revolution during each entire revolution of the stellated wheel, the second stellated wheel being thus used to indicate the number of thousands in the sum of the numbers added together.

I am aware of the calculating-machines de scribed and shown in the United States Patents Nos. 45,829, 74,170, and 99,226.

My calculator differs from these in having the stationary arch or bridge and stud projectin g therefrom, and also in having the stellated wheel pivoted to the rotary disk, so as to have, when the latter is revolved, an orbital movement about the axis of such disk, all of divided disk A, and the stationary bridge or which is productive of advantage, particuarch (l and stud 0, and ccntesinlally divided larly in respect to cheapness of construction and numbered limb B, arranged and adapted and ease of operation. Therefore, 1 in manner and to operate essentially as set I claim as my invention as follows: forth. The improved calculating machine con- M. M. BRIGGS. structed and to operate substantially as de- Witnesses: scribed consisting ofthe rotary stellatcd wheel R. H. EDDY,

D,and centesimally numbered, punctured, and KY. LUNT. 

